android音频播放简单示例

此知识点比较简单，直接上图和代码：
MainActivity:
import java.io.File;import android.app.Activity;import android.media.MediaPlayer;import android.os.Bundle;import android.os.Environment;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity implements OnClickListener {private Button play;private Button pause;private Button stop;private MediaPlayer mediaPlayer = new MediaPlayer();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);play = (Button) findViewById(R.id.play);pause = (Button) findViewById(R.id.pause);stop = (Button) findViewById(R.id.stop);play.setOnClickListener(this);pause.setOnClickListener(this);stop.setOnClickListener(this);initMediaPlayer();//初始化MediaPlayer}//初始化MediaPlayerprivate void initMediaPlayer() {try {//首先通过File对象指定音频文件的路径//此处示例中sd卡中的文件名为“music.mp3”File file = new File(Environment.getExternalStorageDirectory(), "music.mp3");mediaPlayer.setDataSource(file.getPath());//让medieplayer进入准备状态mediaPlayer.prepare();} catch (Exception e) {e.printStackTrace();}}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.play:if (!mediaPlayer.isPlaying()) {mediaPlayer.start();//开始播放}break;case R.id.pause:if (mediaPlayer.isPlaying()) {mediaPlayer.pause();//暂停播放}break;case R.id.stop:if (mediaPlayer.isPlaying()) {//此处是将mediaplayer重置到刚刚创建的状态，也就是还没有设置文件路径的状态mediaPlayer.reset();//停止播放//重新调用重置方法initMediaPlayer();//此处也是可以直接调用stop（）方法，用reset仅仅为了演示}break;default:break;}}//在activity被摧毁的时候将mediaPlayer停止并且释放掉@Overrideprotected void onDestroy() {super.onDestroy();if (mediaPlayer != null) {mediaPlayer.stop();mediaPlayer.release();}}}
activity_main:
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